Underfeed mechanical stoker



sept. 29, 1931.

V. G. LEACH UNDERFEED MECHANICAL sToKER Filed Aug. 24. 192s 'hun muuu Imm Mw IM uhm MH Imm c? ma Patented Sept. 29, 1931 UNITED STATES PATENT OFFICE VERNON G. LEACH, F CHICAGO, ILLINOIS, ASSIGNOR T0 ,MODERN COAL BURNER COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS UNDERFEED MECHANICAL STOKER Application med August 24, 1929. `serial No. 388,063.-

This invention relatesto an underfeed mechanical stoker and more particularly to the construction and arrangement of dead plates in such a stoker.

It is an obj ect of this invention to provide a novel and improved construction of dead plates wherein the assembling and removing of the dead plates is greatly facilitated;

1t is a further important object of 'this invention to' provide dead plates in the form of bars of heavy and rugged construction and provided with cooling ribs or fins, whereby tendencies to warp and crack are eliminated.

@ther and further important objects of this inventionwill be apparent from the disclosures in the specification and thev accompanying drawings.

rl`his invention (in a preferred form) is illustrated in the drawings and hereinafter 2o more fully described.

On the drawings:

Figure 1 is a transverse sectional'view of a furnace setting illustrating the installation of an underfeed mechanical Stoker of my invention.

Figure 2 is a fragmentary top plan view of the Stoker.

Figure 3 is a longitudinal sectional view of one form of dead plate.

Figure 4 is a longitudinal sectional view of another form of dead plate.

As shown on the drawings:

The reference numeral 1 indicates as a whole a furnace housing comprising a lower wall 2 of masonry and side walls 3 extending thereabove. An underfeed mechanical stoker, indicated as a whole by the reference numeral 4, is adapted to be partially housed within the furnace housing 1. Said Stoker 4 comprises a retort 5, a conveyor 6 for feeding and distributing coal or other fuel in said retort, tuyre blocks 7 and ash and slag receiving surfaces 8 and 9 positioned alongside the rows of tuyre blocks 7 and spanning the space between said tuyre blocks and the walls 2.

Front and rear plows 10 and 11, respectively, from the ends of the built-up retort 5, which includes the tuyre blocks 7 positioned 50 along the lateral upper edges of said retort.

Each of said ash and slag receiving surfaces 8 and 9 comprises a plurality of dead plates 12, 13 and 14 which are of relatively narrow, rectangular construction cast in the form of bars. Certain of said dead plates, as for instance, the dead plates 12, are formed with two-male joint forming elements 15 and 16 comprising simply downturned flanges formed along the lateral edges of said dead plates. The inside flange 15 is adapted to rest in and be received by a groove 17 formed by a series of'registering grooves extending transversely along the upper rear edges of the tuyre blocks 7 and end pieces 10 and 11.

The middle dead plates 13, assuming that there are three dead plates on each side of the retort as shown, are provided with female joint forming elements 19 along their inner lateral edges and male joint forming elements 2() along their outer lateral edges. Each of the female jointforming elements 19, includes a longitudinally extending groove 21 for receiving the male joint forming element 16 of the dead plate 12. The dead plates 12 and 13 are provided with longitudinally extending dependent ribs orfins 22 and 23, respectively, to serve both for reinforcing said dead plates and for cooling purposes. Longitudinal grooves 39 in the upper surfaces of the dead plates form guides for the bar used in removing ashes and slag. The ends of said dead plates 12 and 13 are further provided with downturned anges 24 and 25, respectively, adapted to rest directly upon the lower end walls (not shown) of the furnace housing and be sealed thereto, as b means of cement in a similar manner to t e cement seal 40 at the sides.

Each Iof the dead plates 14 forming the outer edge of the ash and slag receiving surfaces, is provided with a female joint forming member 26 having a longitudinal groove 27 for receiving the male joint forming member 20. The joints thus ,formed between theV various dead plates 12, 13 and 14 are preferably further sealed against the leakage of air into the upper space above said deadl plates by means of a suitable cement ,laid within the joint grooves 21 and 27, and for this purpose the edges of the male forming elements may be squared off, as at 21, to provide a space for the cement.

It will be appreciated that by the dead plates in the form of bars extending the full length of the retort 5 and of relatively narrow dimensions, the setting of these dead plates is greatly facilitated. Inasmuch as the inside dead plates 12 being formed with twomale joint forming elements 15 and 16 merely rest in the grooves 17 in the tuyre blocks 7 and in the grooves 21 of the next adjoining dead plates 13, said dead plates 12 may be easily removed for the purpose of removing or replacing any of the tuyre blocks 7, without necessitating the removal of all of the dead plates and therefore with a minimum of labor.

I am aware that many changes may be made and numerous details of construction may be varied through a Wide range without departing from the principles of this invention, and I, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

I claim as my invention:

1. In an underfeed Stoker, the combination of a plurality of tuyre blocks in assembled relation, each having a registering groove formed along an edge, dead plates provided with male and female oint forming elements associated therewith, the dead plate adjacent the grooved edge of the tuyre block having an upstanding and reversely directed portion forming a ridge and a male joint forming element along one of its longitudinal edges, entered in the groove of the tuyre block, and having a second upstanding and :sol

reversely directed portion forming a ridge and a male joint forming element along its other longitudinal edge for cooperation with a female joint forming element on the next adjacent dead plate.

2. A dead plate for a furnace, the said dead 45 lplate comprising a relatively narrow member aving a pair of spaced upstanding and reversely directed curved longitudinal edge portions defining spaced apart ridges and a channel therebetween.

3. A dead plate for a furnace, said dead plate comprising a relatively narrow member aving an upstanding ridge formed along a longitudinal edge and a curved female joint forming portion formed along the same 4. A dead plate for a furnace, said dead plate comprislng arelatively narrow member havingan upstandin ridge formed along a lon tudinal edge an an integrally connec curved female joint forming portion along the same edge, an upstandin ridge formed along its other longitudinal e ge, and a downward y curved male joint forming portion along that edge, a channel being formed between the upstanding ridges.

5. A dead plate for a furnace. said dead plate comprismg a relatively narrow member having an upstandin ridge formed along a longitudinal edge an a downwardly curved male joint forming portion formed along the same edge.

6. A dead plate arrangement for a furnace, comprising a plurality of relatively long and narrow members in interfitted connection with each other, said members having up- Standing and reversely directed curved longitudinal edge portions forming ridges and providing male and female joint forming means for cooperative association between the members, and providing inclined abutting surfaces defining channels on the working surface of the arrangement.

In testimony whereof I have hereunto subscribed my name at Chicago, .Cook County, Il-

linois.

VERNON G. LEACH. 

